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In an AC circuit resistance, inductance and capacitance are connected in series. The values of potential differences across the three are 70 V, 90 V and 65 V respectively. The value of the potential difference of the AC source is

A

70 V

B

225 V

C

85 V

D

74.3 V

Text Solution

Verified by Experts

The correct Answer is:
D
`e=sqrt(e_(R)^(2)+(e_(L)-e_(C))^(2))`
`=sqrt(70)^(2)+(90-65)^(2))=74.3V`
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